#042F48
Closest named color: Oxford Blue (#1B263B). oklch(29.2% 0.064 240.5), rgb(4, 47, 72).
Aa
White text reads best on this color (13.95:1).
About this color
#042F48 is a dark, muted blue. In OKLCH its lightness is 29%, its chroma 0.064 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.037 away. White text reads best on it, at 13.95:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.50:1 |
| White text | 13.95:1 |
Values
| HEX | #042F48 |
| RGB | rgb(4, 47, 72) |
| HSL | hsl(202, 89%, 15%) |
| OKLCH | oklch(29.2% 0.064 240.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #042F48 | 13.95:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #042F48 | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #042F48 text on white | 13.95:1 | AAA | Lc 100.3 | Preferred for body text |
| #042F48 text on black | 1.50:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 950.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C1DDF3
oklch(88.4% 0.043 241.7)
-
Step 300
300
#94C8ED
oklch(81% 0.075 239.8)
-
Step 400
400
#51AAE4
oklch(70.8% 0.12 240.1)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950 (this color)
#042F48
oklch(29.2% 0.064 240.5)
#042F48 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #232F49 | 0.031 |
| Deuteranopia (no green cones) | #1A2948 | 0.026 |
| Tritanopia (no blue cones) | #003538 | 0.041 |
| Achromatopsia (no color) | #2C2C2C | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042F48
#042F48
oklch(29.2% 0.064 240.5)
- #422304
#422304
oklch(29.2% 0.063 60.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #042F48, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.037
- Midnight Green #073B4C ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.044
- Gunmetal #293241 ΔE 0.044
- Marine #042E60 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.050
- Dark #1B2431 ΔE 0.051
Use #042F48 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.